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| author | Andy Hutchinson <hutchinsonandy@aim.com> | 2008-04-04 23:45:46 +0000 |
|---|---|---|
| committer | Andy Hutchinson <hutchinsonandy@gcc.gnu.org> | 2008-04-04 23:45:46 +0000 |
| commit | 3c2397cdcaafb0b75f88a9638412058eb959cb64 (patch) | |
| tree | 608b6af689bb766fb939cdcf3c357eaf819afa5a /gcc/combine.c | |
| parent | 9eb3a0dd852a6a0de2c4849391024e7efc70922d (diff) | |
| download | gcc-3c2397cdcaafb0b75f88a9638412058eb959cb64.zip gcc-3c2397cdcaafb0b75f88a9638412058eb959cb64.tar.gz gcc-3c2397cdcaafb0b75f88a9638412058eb959cb64.tar.bz2 | |
re PR target/34916 (gcc.c-torture/execute/pr27364.c fails with -O1, -O2 and -Os)
PR rtl-optimization/34916
PR middle-end/35519
* combine.c (create_log_links): Do not create duplicate LOG_LINKS
between instruction pairs
From-SVN: r133920
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 0fca12d..db828e8 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -1,6 +1,6 @@ /* Optimize by combining instructions for GNU compiler. Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, - 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 + 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. This file is part of GCC. @@ -976,8 +976,18 @@ create_log_links (void) assignments later. */ if (regno >= FIRST_PSEUDO_REGISTER || asm_noperands (PATTERN (use_insn)) < 0) - LOG_LINKS (use_insn) = - alloc_INSN_LIST (insn, LOG_LINKS (use_insn)); + { + /* Don't add duplicate links between instructions. */ + rtx links; + for (links = LOG_LINKS (use_insn); links; + links = XEXP (links, 1)) + if (insn == XEXP (links, 0)) + break; + + if (!links) + LOG_LINKS (use_insn) = + alloc_INSN_LIST (insn, LOG_LINKS (use_insn)); + } } next_use[regno] = NULL_RTX; } |